Olivia was the eldest daughter of
George Montagu, 6th Duke of Manchester, and his first wife, the former Millicent Sparrow. She married the earl on 29 January 1850 at
Kimbolton Castle,
Huntingdonshire. They had five children: • Charles Bennett, Lord Ossulston (1850-1879), who died in India, of cholera, aged 28, unmarried •
George Montagu Bennet, 7th Earl of Tankerville (30 March 1852 – 9 July 1931) he married Leonora van Marter and had children. • Hon. Frederick Augustus (1853-1891), who died unmarried. • Lady Corisande Olivia (1855-1941), who died unmarried. • Lady Ida Louise (1857-1887), who married
John Ramsay, 13th Earl of Dalhousie, and had children. Their oldest son, Lord Ossulston, purchased a commission in the
Coldstream Guards in 1870, later transferring to the
Rifle Brigade as a lieutenant in 1873. Following his death, the second son, George, became heir to the earldom. Her only published work was a pamphlet,
A Bright Spot In Outcast London. It was published in 1884, and was reprinted by Nabu Press in 2011. The countess died at Greystokes, Tunbridge Wells, Kent, aged 91. ==References==